zeroLengthContactD element

[yinxia3690]

Dear everyone,
I am sorry to disturb you again,but I need help.
I added the zeroLengthContactD element between two BeamColumn elements successfuly .However ,I modulate the analysis for all the situations,it does not work.(matrix is singular)
I know the zeroLengthContactD element can be used in the brick elements,but is it [b]only[/b] used in tne brick elements?Doesn't it work in the BwamColumn elements?
Thank you very much!

[fmk]

as gang wang as told you directly .. you have to add additional nodes that have 3dof to use the contact element and then constrain them using the equalDOF command